After appropriate design loads are calculated, the sheathing, studs, and wales are analyzed in turn, considering each member to be a uniformly loaded beam supported in one of the three conditions (single span, two spans, or three or more spans) to determine the stresses developed in each member. Vertical supports and lateral bracing must be checked for compression and tension stresses. Except for sheathing, bearing stresses must be checked at supports to ensure safety against buckling. Using the methods of engineering mechanics, the maximum values of bending moment, shear, and deflection developed in a uniformly loaded beam of uniform cross section is shown in Tables 3.15 to 3.17.
The maximum fiber stresses in bending, shear, and compression resulting from a specified load may be determined from the following equations: